The calculator in question is Schonfeld's Criteria for Fat Embolism Syndrome. This clinical scoring system is used specifically in patients who have experienced long bone fractures or orthopedic surgery, particularly those involving the pelvis or lower extremities. The calculator is designed to aid in the diagnosis of Fat Embolism Syndrome (FES), a potentially life-threatening complication that can occur after such injuries or procedures.

Schonfeld's Criteria for Fat Embolism Syndrome uses a point-based system to evaluate the likelihood of FES based on the presence of certain clinical features. These features include hypoxemia, neurological abnormalities, petechial rash, fever, tachycardia, and sudden drop in hematocrit or platelet count.

The clinical utility of this calculator is to help clinicians identify patients who may be developing FES, allowing for earlier intervention and potentially improving patient outcomes. It is important to note that this calculator should not be used in isolation, but rather as part of a comprehensive clinical assessment. 

There are no specific exclusion criteria for the use of Schonfeld's Criteria for Fat Embolism Syndrome, but it may be less applicable or reliable in patients with pre-existing conditions that could mimic the symptoms of FES, such as chronic lung disease or neurological

Schonfeld's criteria for fat embolism syndrome

# Criteria
 A. Petechiae (+5)
B. Diffuse alveolar infiltrates on chest X-ray (+4)
C. Arterial partial pressure of oxygen < 70 mmHg (+3)
D. Fever > 38 degrees C (+1)
E. Heart rate > 120 bpm (+1)
F. Respiration rate > 30 bpm (+1)

# Conditions
- score >= 5
- true
- score == 0